I possibly sail around on an intrigue (7)
I believe the answer is:
liaison
'an intrigue' is the definition.
(I've seen this before)
'i possibly sail around on' is the wordplay.
'possibly' indicates an anagram.
'around' means one lot of letters goes inside another.
'sail' is an anagram of 'lais'.
'i' placed inside 'lais' is 'liais'.
'liais'+'on'='LIAISON'
(Other definitions for liaison that I've seen before include "Communication; relationship" , "Illicit romance" , "An affair or mediation" , "Sort of officer" , "Intermediary" .)